Hey all. I'm thinking about buying a z400 for 900 dollars. It's a 2003, and the guy said it needs a new top end and it doesn't have an exhaust, other than that the quad looks phenomenal. How are z400s in terms of trail bikes and reliability? How fast are they compared to the 450s. I know when the 450s first came out that some of the Suzuki riders had to race their 400s against the 450s and they competed quite well.